The URL for doing the download refers to "actiontec gateway",
which despite your claims of it being the name of the device
does not appear visibly on the page. As well, this is not a
page for general software distribution but a place for people
who have the Verzion FiOS router to get firmware upgrades.
Those people have already received a Verizon-branded manual
<http://support.actiontec.com/doc_files/MI424WR_Rev._E_User_Manual_20.8.0_v3.pdf>
which discusses the GPL and an accompanying free software disk
which most likely tell them where to go for upgraded sources,
which are available on the manufacturer's web site.
You would like to hold Verizon to a stricter set of requirements
than the rights holders do, but only so you can claim that they
are deliberately violating them, but that won't work. All the
GPLed sources are made properly available by the manufacturer,
and people who receive the routers are informed of their rights
under the GPL by Verizon. And all of this came about through the
actions of the SFLC.